First time incubator hatcher

First time incubating. Have so far had 3 out of 7 successfully hatch.
But a couple issues

First hatched day 22.5 black/yellow feathered and healthy looking

Second one hatched day 23 yellow feathered early hours in morning still had the umbilical cord attached to shell so was dragging whole shell when it walked. Shell has removed now. Otherwise appears healthy.

Third one hatched day 23 around 3:30 black/yellow feathered but with an egg yolk sack still attached .

Unfortunately the other two pecked at the yolk sack and it looks like a blood bath in incubator.so the 2 were safely removed into brooder and the 3rd is left with remaining unhatched eggs still drying off. Will the chicken survive being its yolk sack has been pecked at ??
Will it fall off eventually being it didn't get absorbed into the body or will it need to be removed to stop any infection??

The yolk sac will probably eventually absorb and/or fall off, but the important part is not to let it get infected. Some people use antibiotic ointment, and place the chick into a clean brooder. Also, as a note, since your chicks hatched that late, you need to increase the temp and decrease the humidity in your incubator for the next time. Chicks born late are more likely to have issues.

Hey for the future, if they have raw navel put flour on it to stop seeping. If I ever have a chick attatched to the shell, I don't cut the cord, I just crumble off the hard shell part and leave it attatched to the soft lining. there is less dragging and it eventually drys up and falls off.